From a user: This how I have setup Builder 5 to use with OpenGL with Windows 98. All the examples I have tried out in you book work with this so far. Execute the following commands at the DOS prompt impdef opengl32.def opengl32.dll impdef opengl32.lib opengl32.def del opengl32.def implib glu32.lib glu32.dll Copy all the header file to C:\Program Files\Borland\CBuilder5\Include\Gl . Copy all the library files to C:\Program Files\Borland\CBuilder5\Lib\gl . You will also have to execute coff2omf on the some of the library files probably on opengl32.lib for sure. The command line options for this are in the Borland help files. Glu32.lib and opengl32.lib must be added to your project. Click on Project then options directories from the tool bar. My Include paths are C:\Program Files\Borland\CBuilder5\include\gl and C:\Program Files\Borland\CBuilder5\include\rw The library paths are $(BCB)\lib\obj,$(BCB)\lib\;(BCB)\lib\psdk C:\Program Files\Borland\CBuilder5\Lib\gl